JP6238279B2 - Earth leakage detector - Google Patents

Description

  The present invention relates to a leakage detection device, and more particularly to a leakage detection device that can suppress erroneous detection of leakage.

  As a conventional leakage detection device, a device that detects leakage when a current value is detected to be equal to or greater than a threshold value is generally known. As this type of leakage detection device, for example, as shown in FIG. 6, one in which a fuse is blown when a large current a (shown by a solid line in the figure) flows and becomes a threshold value or more is proposed. Here, for example, there is a case where the current b (indicated by a two-dot chain line in the figure) instantaneously exceeds the threshold value and again falls below the threshold value (that is, not a complete leakage). In this case, the conventional leakage detection device uses a fixed threshold determined by the fuse to detect the leakage when detecting that the current value exceeds the threshold once. Resulting in. Furthermore, it is difficult for conventional leakage detection devices to detect leakage with a relatively small current value.

  In addition, what is mounted in vehicles, such as an electric vehicle and a train, is known as another conventional earth-leakage detection apparatus (for example, refer patent document 1). However, even the technique of Patent Document 1 detects a leakage when detecting that the current value is equal to or greater than the threshold value once, and there is a risk of erroneous detection of the leakage.

Japanese Patent Laid-Open No. 6-153301

  This invention is made | formed in view of the said present condition, and an object of this invention is to provide the leak detection apparatus which can suppress the misdetection of a leak.

In order to solve the above problem, an invention according to claim 1 is an leakage detection device for an actuator that drives a movable device including a movable portion mounted on a vehicle, and includes a drive circuit for driving the actuator. When it is detected that the flowing current value is equal to or greater than a predetermined threshold value a plurality of times continuously, it is determined that there is a leakage, and when the current value flowing through the drive circuit is equal to or greater than the predetermined threshold value when the actuator is stopped When the leakage predictor is detected at the nth time (n is a natural number) when the number of detections of the leakage predictor is not a predetermined number of times , the actuator is as the inoperable state sets a predetermined stabilization period, and summarized in that for sensing the (n + 1) th of the earth leakage indication after a lapse of the stabilization period.
For reference , in the invention according to claim 1, the threshold value can be set to 0.3 to 1.0 amperes.

According to the leakage detection device of the present invention, it is determined that leakage when the value of the current flowing through the driving circuit for driving the actuator is detected a plurality of times consecutively that is above a predetermined threshold. Thereby, erroneous detection of leakage can be suppressed.
Further, when the value of the current flowing through the drive circuit for driving the actuator when the actuator is stopped is equal to or greater than a predetermined threshold, a leakage predictor is detected, and the number of detections of the leakage predictor is predetermined. when not a plurality of times, if (n is a natural number) n th is the detection of the earth leakage indication, the in the inoperative state the actuator sets a predetermined stabilization period, the stable period Since the current leakage sign is detected n + 1 times after the time elapses , the fluctuation of the current value is stabilized, so that erroneous detection of leakage can be more reliably suppressed and damage to the actuator can be prevented.
For reference, when the threshold value is 0.3 to 1.0 ampere, a leakage can be detected based on a relatively small current value.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a perspective view of a sheet | seat provided with the leakage detection apparatus which concerns on an Example. It is a side view of the said sheet | seat. It is a block diagram for demonstrating the said electric leakage detection apparatus. It is a flowchart figure for demonstrating the leak detection process by the said leak detection apparatus. It is explanatory drawing for demonstrating the leak detection process by the said leak detection apparatus. It is explanatory drawing for demonstrating the conventional leak detection apparatus.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Electrical leakage detection device>
The leakage detection device according to the present embodiment is an leakage detection device (11) for an actuator that drives a movable device having a movable portion mounted on a vehicle, and a current value flowing through a drive circuit for driving the actuator is When it is detected a plurality of times that it is equal to or greater than a predetermined threshold value, a leakage is detected (see, for example, FIGS. 4 and 5).

    As the leakage detection device according to the present embodiment, for example, when the value of the current flowing through the drive circuit (16) for driving the actuators (M1 to M3) is equal to or greater than a predetermined threshold, the leakage predictor (A1, A2) is displayed. When the number of detections of the leakage predictor is not a predetermined number of times, the actuator (M1) is detected between the detection of the nth (n is a natural number) leakage predictor and the detection of the (n + 1) th leakage predictor. To M3) may be set in a predetermined stable period (t2) in which the operation is disabled (see, for example, FIGS. 3 to 5).

  The “actuator becomes inoperable” is intended to mean a state where no current flows in the drive circuit. Examples of the “predetermined stable period” include 1 to 30 seconds (preferably 5 to 20 seconds).

  As an electric leakage detection apparatus according to the present embodiment, for example, the threshold value may be 0.3 to 1.0 amperes.

  As the leakage detection device according to the present embodiment, for example, a leakage detection sign detection unit (steps S1 to S3) that detects a leakage prediction sign (A1, A2) when the current value is equal to or greater than a predetermined threshold, and detection of the leakage sign There can be mentioned a mode (see, for example, FIG. 4 and FIG. 5) including a leakage determination means (steps S5 and S7) for determining leakage when the number of times reaches a predetermined number.

  In the case of the above-described form, for example, the leakage predictor detecting means (steps S1 to S3) is a leakage predictor when the value of the current flowing through the drive circuit (16) for driving the actuators (M1 to M3) is equal to or greater than a threshold value. (A1, A2) is detected, and the leakage detection device (11) detects the leakage predictor for the nth time (n is a natural number) when the number of detections of the leakage predictor is not a predetermined number of times. Stabilization period setting means (steps S5 and S6) for setting a predetermined stabilization period (t2) for disabling the actuators (M1 to M3) between the detection of the (n + 1) th leakage predictor can be provided. (For example, see FIGS. 3 to 5 etc.).

<Leakage detection method>
The leakage detection method according to the present embodiment is a leakage detection method using the leakage detection device (11) according to the above-described embodiment, and the leakage is detected when it is detected a plurality of times that the current value is equal to or greater than a predetermined threshold value. Detect (see, for example, FIGS. 4 and 5).

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In addition, in a present Example, the earth-leakage detection apparatus for seats mounted in a train as a vehicle is illustrated. Further, in this embodiment, it is assumed that a plurality of sheet rows arranged in the horizontal direction by combining a connection sheet and / or a single sheet in which a plurality of sheets are connected are provided in the train in the vertical direction.

(1) Configuration of Seat As shown in FIGS. 1 and 2, the seat 1 according to the present embodiment includes a seat body 2, and a shell 3 that houses the seat body 2 so as to cover the back and sides thereof, It has. The seat body 2 includes a cushion part 4 serving as a seat, an ottoman part 5 connected to the front end side of the cushion part 4 and a footrest, and a back part 6 connected to the rear end side of the cushion part 4 and serving as a backrest. I have. The cushion portion 4 is provided so as to be tiltable (ie, tiltable) by driving the motor M1. The ottoman portion 5 is provided so as to be tiltable by driving the motor M2. Further, the back portion 6 is provided so as to be tiltable (that is, capable of being tilted) by driving the motor M3.

  The motors M <b> 1 to M <b> 3 are driven by operating a switch operation unit 7 (see FIG. 1) provided on the distal end side of the armrest of the seat 1 and controlled by a control unit described later. The motors M1 to M3 constitute an “actuator” according to the present invention.

(2) Configuration of Earth Leakage Detection Device An earth leakage detection device 11 according to the present embodiment is provided on the seat 1 (see FIG. 1). As shown in FIG. 3, the leakage detection device 11 includes a control unit 12 (also referred to as an ECU (Electronic Control Unit)) that controls driving of the motors M1 to M3. The control unit 12 includes a CPU 13 (Central Processing Unit) and a memory (not shown) (for example, ROM (Read Only Memory), RAM (Random Access Memory), etc.). Further, the control unit 12 includes an input circuit 14 to which an operation signal from each switch 15 of the switch operation unit 7 is input. Further, the control unit 12 includes a motor drive circuit 16 for driving the motors M <b> 1 to M <b> 3 and a current detection circuit 17 for detecting a current value flowing through the motor drive circuit 16. Between the motor drive circuit 16 and the current detection circuit 17, a relay 19 for interrupting the connection between the circuits 16 and 17 is interposed. The motor drive circuit 16 is supplied with a power supply 18.

  The control unit 12 executes a leakage detection process described below. In this leakage detection process, as shown in FIG. 4, when the motors M1 to M3 are stopped, the current value flowing through the motor drive circuit 16 (that is, the current value detected by the current detection circuit 17) is a predetermined threshold value (for example, 0.4A) or more is determined (step S1). Next, it is determined whether or not the detection of the current value has continued for a predetermined time (for example, 100 ms) (step S2). As a result, if the current value is equal to or greater than a predetermined threshold and the detection continues for a predetermined time (YES in steps S1 and S2), a leakage sign is detected (step S3), and the number of detections is counted and stored. (Step S4). If NO is determined in step S1 or step S2, the process returns to step S1.

  Next, it is determined whether or not the number of detections of an electrical leakage predictor is less than a predetermined value (for example, twice) that is a predetermined number of times (step S5). As a result, when the number of times of detection is less than a predetermined value (YES determination in step S5), a predetermined stable period (for example, 10 seconds) in which the motors M1 to M3 are inoperable is set (step S5). . Next, after the stabilization period has elapsed, the process returns to step S1 to detect the next leakage predictor. On the other hand, when the number of detections reaches a predetermined value (NO determination in step S5), it is determined that the leakage is complete (step S7).

  Here, when the motors M1 to M3 are inoperable, the relay 19 disconnects the connection between the motor drive circuit 16 and the current detection circuit 17, and does not accept operation signals from the switches of the switch operation unit 7. That is done. In addition, detection of a leakage predictor (steps S <b> 1 to S <b> 3) is performed in a state where the motor drive circuit 16 and the current detection circuit 17 are connected by the relay 19.

  The control process by the control unit 12 may be realized by either hardware or software, and preferably includes a microcontroller (microcomputer) having a CPU, memory (ROM, RAM, etc.), input / output circuits, and the like. A peripheral circuit such as an input / output interface can be provided at the center.

(3) Action of Earth Leakage Detection Device Next, the action of the earth leakage detection device 11 having the above configuration will be described. In the present embodiment, it is assumed that the leakage is determined by detecting the leakage predictor twice. As shown in FIG. 5, when the value of the current flowing through the motor drive circuit 16 is equal to or greater than a predetermined threshold and the detection continues for a predetermined time t1, the first leakage predictor A1 is detected. Next, when the current value flowing through the motor drive circuit 16 is equal to or greater than a predetermined threshold and the detection continues for a predetermined time t1 after the elapse of the predetermined stable period t2 in which the motors M1 to M3 are inoperable, A second leakage predictor A2 is detected.

  As described above, when the second leak predictor A2 is detected after the stable period t2 has elapsed since the first leak predictor A1 is detected, it is determined that the leak is complete and the hardware is stopped (ie, on the circuit). In a state of being interrupted so that no current flows in the On the other hand, if the second leakage predictor A2 is not detected after the stable period t2 has elapsed since the detection of the first leakage predictor A1, it is determined that the leakage is not complete and the hardware is in the drive state (ie, the current on the circuit). Normal state).

(4) Effects of the Embodiment As described above, according to the leakage detection device 11 of the present embodiment, the leakage is detected when it is detected a plurality of times that the current value is equal to or greater than the predetermined threshold value. Thereby, erroneous detection of leakage can be suppressed. Furthermore, as compared with the conventional one in which leakage detection is performed using a fuse, cost reduction and free threshold setting can be easily performed.

  Further, in this embodiment, when the value of the current flowing through the motor drive circuit 16 for driving the motors M1 to M3 is equal to or greater than the threshold value, the leakage predictor is detected, and the number of detections of the leakage predictor is a predetermined number of times. If not, a predetermined stable period t2 in which the motors M1 to M3 are inoperable is set between the detection of the n-th (n is a natural number) leakage predictor and the detection of the (n + 1) -th leakage predictor. . Thereby, the fluctuation of the current value is stabilized, and erroneous detection of leakage can be more reliably suppressed, and damage to the motors M1 to M3 can be prevented.

  Furthermore, in the present embodiment, since the threshold value is 0.3 to 1.0 ampere, it is possible to detect a leakage based on a relatively small current value.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the said Example, although the earth-leakage detection apparatus 11 for the sheet | seat 1 was illustrated, it is not limited to this, For example, as long as it mounts in a vehicle, it is a movable apparatus provided with movable parts, such as a slide door and a power window. It is good also as an earth leakage detection apparatus used. Furthermore, it is good also as an electrical leakage detection apparatus used for an illuminating device or a speaker apparatus.

  Moreover, in the said Example, although leakage was determined based on the electric current value which flows through the motor drive circuit 16 for driving the motors M1-M3, it is not limited to this, For example, it consists of LED, a light bulb, etc. The leakage may be determined based on the current value flowing through the circuit for driving the light source, or the leakage current may be determined based on the current value flowing through the circuit for outputting sound with a speaker or the like.

  In the above embodiment, the predetermined stable period t2 during which the actuators M1 to M3 are inoperable is set between the detection of the current leakage sign A1 and the detection of the next leakage sign A2. However, the present invention is not limited to this. For example, a predetermined period in which the actuators M1 to M3 are operable can be set between the detection of the current leakage predictor A1 and the detection of the next leakage predictor A2. Also good.

  Furthermore, in the said Example, although it was made to determine an electric leakage according to the detection of the electric leakage predictor A1 of 2 times, it is not limited to this, For example, an electric leakage is detected according to the detection of the electric leakage predictor of 3 times or more. You may make it determine.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  In addition to passenger cars, buses, trucks, etc., it is widely used as a technique for detecting electric leakage in vehicles such as trains, trains and other railway vehicles, construction vehicles, agricultural vehicles, industrial vehicles, and aircraft.

  11: Electric leakage detection device, 16: Motor drive circuit, A1, A2; Prediction of electric leakage, M1 to M3; Motor, t2;

Claims (1)

An electric leakage detection device for an actuator that drives a movable device having a movable portion mounted on a vehicle,
When the current value flowing through the drive circuit for driving the actuator is equal to or greater than a predetermined threshold, it is determined that there is a leakage when continuously detected multiple times ,
When a current value flowing through the drive circuit when the actuator is stopped is greater than or equal to a predetermined threshold value, an electrical leakage sign is detected,
When the detection frequency of the earth leakage indication is not the plurality of times of predetermined (n is a natural number) n-th when the detection of the earth leakage indication, the in the inoperative state the actuator A leakage detecting device , wherein a predetermined stable period is set and the leakage sign is detected n + 1 times after elapse of the stable period .

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